Highly efficient silica adsorbent functionalized with propylene oxide-modified pentaethylenehexamine for CO2 capture under NGCC flue gas conditions
Year: 2025
Type: article
Abstract: Carbon capture utilization and storage (CCUS) is a crucial strategy to mitigate climate change, with solid sorbents are promising option due to their energy efficiency. A macroporous silica (MPS) adsorbent functionalized with propylene oxide (PO)-modified pentaethylenehexamine (PEHA) (2.0PO-PEHA/MPS) showed effective CO 2 capture from both coal-fired power plant (CFPP) and natural gas combined cycle (NGCC) flue gases, as confirmed by CO 2 isotherm measurements. Building on our previous work with CFPP flue gas, this study investigates its performance under NGCC conditions using the programmed adsorption–desorption (TPAD) method with a stainless-steel fixed-bed reactor. The optimal conditions were identified as 50 ℃ for adsorption and 120 ℃ for regeneration. Cyclic adsorption–regeneration experiments performed by thermogravimetric analysis (TGA) showed stable working capacity over 20 cycles. Notably, TGA tended to overestimate H 2 O uptake because it did not fully account for the competitive adsorption between CO 2 and H 2 O. To overcome this limitation, Our TPAD method, a more process-relevant fixed-bed flow approach, was introduced, providing highly reliable and quantitative results (CO 2 : 10.28 wt%, H 2 O: 3.51 wt%). Based on TPAD data, the theoretical regeneration heat was calculated to be 2.96–79 GJ tCO 2 −1 at 120 ℃, representing a relatively low value compared with other materials. These results highlight the potential of 2.0PO-PEHA/MPS for CO 2 capture from NGCC flue gas, underscore the critical role of TPAD-based quantification for accurately determining low regeneration heat, thereby advancing the field of CO 2 capture.
Source: Journal of CO2 Utilization
Authors: Ji Hyeon Whang, Yooseob Won, A Ra Cho, Yunji Son, Yongseon Lee, Yuntae Hwang, Dong-Kyu Moon, Jae-Young Kim, Sung-Ho Jo, Young Cheol Park, Ki Bong Lee, Dong-Ho Lee
Institutions: Korea University, Korea Institute of Energy Research
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,360
Awards: G2945971303, G8082026957
OpenAlex ID: W7114903935